DE274669C - - Google Patents

Description

IMPERIAL

PATENT OFFICE.

PATENT LETTERING

- Yes 274669 CLASS 52 «. GROUP

WILHELM KÄBISCH in HAMBURG.

Hand lever sewing machine. Patented in the German Empire on January 12, 1913.

The invention relates to a hand lever sewing machine in which the needle bar moving lever also drives the stitch-forming organs. So that such hand lever sewing machine. 5 must find practical use, the presser driving mechanism of simple, easy to understand design and be reliable, properties that at the same time justify the advantage of cheap production of sewing machines.

According to the invention, the presser bar is curved like the needle bar and is guided next to this in a guide in a flat arc, on the arm of one on

¹ S machine frame pivoted double lever, which is intermittently coupled by a wart on its other arm to a spring-loaded pawl that is rotatably attached to the lever that moves the needle bar and the stitch-forming elements, so that the presser button is raised during the downward movement of the needle when the needle enters but is released into the fabric and remains resting on the fabric until the needle begins its downward movement again after it has completed its upward movement.

Another feature of the invention is that the double lever rotatably mounted on the machine frame by means of a wire loop carries a clamping roller under ■ spring action, which rests in a downwardly tapered recess of the presser rod, which is open laterally against the presser rod guide, so that the clamping roller in in its lowest position, the presser button against 40

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able to jam unintentional upward movement in the guide.

The drawing shows an embodiment of the subject matter of the invention, namely shows

Fig. Ι the lever sewing machine in a vertical Longitudinal section;

FIG. 2 shows a section along the line AB of FIG.

Fig. 3 is a side view of the machine;

Fig. ~ 4 shows a section along the line CD of Fig. Ι.

In the machine frame α to dare right axis c rotatably mounted two-armed lever b i by a slidable in its one tubular-shaped end of rod to the joint k with the guided at a shallow arc needle bar I, but at the other end with the stitch-forming organs .

The needle bar Z, which is set up in a known manner for inserting the needle η , slides in a correspondingly curved guide m arranged on the machine frame α , which, in addition to the needle bar, also serves as a guide for the likewise curved presser bar.

The presser button ο carries at the upper end protruding from the guide m a lateral pin p to which a tension spring q is attached, the lower end of which engages an eyelet r attached to the outside of the guide m . The pin p penetrates through a correspondingly large hole in a double lever s around the pin t

is rotatable on the frame α , and the inner end of which runs out in a handle u , which conveniently allows the presser button ο to be lifted under tension of the tension spring q.

The double lever s is under the influence of the two-armed lever b which moves the needle bar I. For this purpose, one is attached to the latter under the influence of a spring y

ίο articulated standing pawl ν , which is able to grip with a nose w over a wart χ arranged on the double lever s and, through the coupling caused by it, lifts the presser 0 during the downward movement of the lever b until it lifts its nose w from the wart χ slides off.

The presser bar is provided within the guide m with a laterally open recess i , which tapers at the lower end as a result of the inclined wall 2. In this recess there is a roller 3 which is loaded by a helical spring 4 and thereby pressed into the tapered part of the recess i , so that the roller is able to clamp the presser foot 0 against unintentional upward movement in the guide m. The pinch roller 3 sits on a wire loop 5 running through the coil spring 4, which is suspended from a pin 6 of the double hebeis s so that it clamps in during the movement of the presser foot 0 caused by the pawl ν under the swinging movement of the two-armed lever b the leadership m cancels.

The drive of the stitch-forming organs, which does not form part of the invention, is derived in the embodiment from the lever b that the handlebar 8 rotatable about the pin 7 engages the inner arm g, the movement of which is controlled by the cam 9 . The lower loop catcher 10, which works together with the needle η , is driven by a toothed rack 11 which is moved to and fro and which is coupled to the link 8.

Assuming that the lever b is in the position shown in Fig. 1, during its downward movement caused by the hand lever e by the pawl ν acting on the Doppelhebei s first the presser foot 0 is raised until the under the action of the spring y standing pawl * ν is able to slide off the wart χ on the double lever s that is rotated in the process. After the double lever s has been released by the pawl ν and the resulting downward movement of the presser foot 0 , the needle η is guided into the needle plate provided with a corresponding through hole with the continued downward movement of the lever b , so that it causes the stitch formation.

During the upward movement of the lever b, which takes place by lifting the hand lever e , the presser foot 0 remains in its lower position, but the nipple χ on the double lever s has the opportunity to come into engagement with the nose w on the pawl υ, so that after another reversal of the direction of movement of the lever b, the presser foot 0 is first raised again and, after the needle η has penetrated into the fabric, is released to hold the latter.

Claims (2)

Patent Claims: 1. Hand lever sewing machine, in which a hand lever moved to a horizontal axis rotatable, two-armed lever by one in its one tubular designed end of the displaceable rod articulated to the needle bar guided in a flat arc is, but at its other end is connected to the stitch-forming organs, characterized in that the presser foot (0) on one arm of a double lever rotatable on the machine frame (s) is articulated, which is intermittently coupled by a lug (x) on its other arm to a pawl (υ) , which is rotatably attached to the two-armed lever (b) , which is moved by the hand lever and is under the influence of a spring (y), so that the presser button is raised during the downward movement of the needle, but is released when the needle enters the fabric and remains resting on the fabric until the needle begins its downward movement again after the upward movement has been completed. 2. Hand lever sewing machine according to spoke i, characterized in that a spring-loaded clamping roller (3) is carried by the rotatably mounted on the machine frame double lever (s) by means of a wire loop (5), which is open in a laterally against the pusher rod guide in) after The bottom tapered recess (i) of the presser bar rests so that the pinch roller in its lowest position is able to clamp the presser (0) against unintentional upward movement in the guide (m) . 1 sheet of drawings.